Aggregates, Elastic-Modulus, and Poisson's Ratio of Concrete


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Title: Aggregates, Elastic-Modulus, and Poisson's Ratio of Concrete

Author(s): Sami A. Klink

Publication: Journal Proceedings

Volume: 83

Issue: 6

Appears on pages(s): 961-965

Keywords: aggregates; compressive strength; concretes; deformation; density (mass/volume); heavyweight aggregates; lightweight aggregates; modulus of elasticity; Poisson ratio; strains; stresses; structural analysis; tests.

Date: 11/1/1986

Tests were carried out on specimens of heavyweight, normal weight, and lightweight concrete for determining the effects of aggregates on the elastic modulus and Poisson's ratio in compression at the centers of the corresponding specimens. Internal strains were measured by means of embeddable strain-gage units especially constructed for this investigation. The test results showed that the mineral compositions of the aggregates used have negligible effects on the elastic modulus and Poisson's ratio of concrete and confirmed previous findings, namely, that these elastic constants at the centers of concrete specimens, referred to as "actual" in this paper, are about 55 percent higher than those obtained by the standard methods of test. They also confirmed the existence of the previously established relations between the actual elastic constants, density, and compressive strength of concrete, which should prove useful for structural designers in rationally predicting deformations, displacements, stresses and losses in prestressed and ordinary reinforced plates, shells, and other types of concrete structures.